Compliance & Resource Center
Railcar marking, identification & FRA/AAR compliance
Plain-English guides to the rules behind railcar markings — conspicuity tape, reporting marks, stenciling, AEI tags, and tank car placarding. Federal requirements are cited to the primary source so you can verify them yourself.
CHEMTREC and the Emergency Response Number: What Rail Hazmat Shipments Must Carry
Every hazardous material offered for transport — including by rail — must carry a 24-hour emergency response telephone number under 49 CFR 172.604. CHEMTREC is the service most shippers use to satisfy it. Here is what the rule requires, how CHEMTREC fits, and what the number looks like on the car.
Tank Car Marking Regulations: Placards, ID Numbers, and Qualification Stencils
Tank car markings answer to three authorities: PHMSA writes the hazmat placarding and marking rules (49 CFR Part 172), the qualification-date stencils come from Part 180, and the AAR tank car spec (M-1002) is incorporated by reference. Here is how the pieces fit.
AEI Tags on Railcars: How They Work and When They Must Be Replaced
AEI (Automatic Equipment Identification) tags are the passive RFID tags read by trackside scanners to identify rail equipment. Here is how they work, what they encode, the AAR standard behind them, and when a tag must be reprogrammed or replaced.
Railcar Stenciling Requirements: The Data on a Freight Car Side, Explained
The block of letters and numbers stenciled on a freight car — reporting mark, load limit, light weight, maintenance dates — is governed by two layers: a federal floor in 49 CFR Part 215 and the AAR interchange marking system. Here is how to read it and what is actually required.
Railcar Reporting Marks Explained: What Those Letters and Numbers Mean
Every North American railcar carries a reporting mark — the letter prefix and number that uniquely identify it. Here is what they mean, who assigns them (the AAR through Railinc), and the federal stenciling rule that governs how they appear on the car.
FRA Part 224 Conspicuity Marking: A Practical Guide to Reflective Tape on Freight Cars
Conspicuity marking — the retroreflective sheeting on the sides of freight cars — is required by FRA 49 CFR Part 224 to make trains visible at highway-rail grade crossings. Here is what the rule covers: material grade, placement, the inspection threshold, and who is responsible.